How do you parse json object inside a json array?

Question

I am pretty weak with JSON, and probably have a silly question, and was wondering how to parse a JSON object placed inside a JSON array. So, as of now, I have

public Single<Profile> doProfileApiCall() {
        return Rx2AndroidNetworking.post(ApiEndPoint.ENDPOINT_PROFILE)
                .addHeaders(mApiHeader.getProtectedApiHeader())
                .build()
                .getObjectSingle(Profile.class);

To retrieve my profile params, but in my endpoints I have :

[{"Name": "this", "Email","[email protected]"}]

I have my endpoint set up as :

 public static final String ENDPOINT_PROFILE =
            BuildConfig.BASE_URL
            + "/linktojson";

which gives me the above JSON. but the issue is the [], how do I modify this with :

 public Single<Profile> doProfileApiCall() {
            return Rx2AndroidNetworking.post(ApiEndPoint.ENDPOINT_PROFILE)
                    .addHeaders(mApiHeader.getProtectedApiHeader())
                    .build()
                    .getObjectSingle(Profile.class);

such that I can use my profile.java model class which has

public class Profile {
    @Expose
    @SerializedName("Name")
    private String name;
    @Expose
    @SerializedName("Email")
    private String email;
    etc...
}

Any idea how to go about this?

I think what you have there is a JSONArray with a single JSONObject in, i believe that this question might be of some help to you. parse JSONArray — Nils Kähler
– Nils Kähler, Commented Mar 7, 2019 at 20:42
cant i use : Rx2AndroidNetworking.post ? my array will grow soon and profile.java model class will consist of more json objects but all be within 1 array — user2386226
– user2386226, Commented Mar 7, 2019 at 20:47
Are you using the retrofit library for making API requests? If not can you specify the library name which you are using? — Atchyut Maddukuri
– Atchyut Maddukuri, Commented Mar 7, 2019 at 20:52

Atchyut Maddukuri · Accepted Answer · 2019-03-07 21:30:28Z

1

In the doProfileApiCall() method instead of .getObjectSingle use

.getJSONArraySingle(ProfileList.class)

Now create a new class ProfileList.java with the following code.

List<Profile> profileList = new ArrayList<>();

public List<Profile> getProfileList() {
    return profileList;
}

public void setProfileList(List<Profile> profileList) {
    this.profileList = profileList;
}

Change the returntype of the doProfileApiCall method to

public Single<ProfileList> doProfileApiCall()

Whenever you want to access the data use it with the list position 0, when in future you get more data, you can index the data accordingly.

answered Mar 7, 2019 at 21:30

Atchyut Maddukuri

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Comments

Michał Ziober · Accepted Answer · 2019-03-07 21:16:25Z

0

Generally, if JSON root object is an array you should use List on Java side. In your case you have array so use related method:

return Rx2AndroidNetworking.post(ApiEndPoint.ENDPOINT_PROFILE)
          .addHeaders(mApiHeader.getProtectedApiHeader())
          .build()
          .getObjectListSingle(Profile.class);

Rx2ANRequest source.

answered Mar 7, 2019 at 21:16

Michał Ziober

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6 Comments

user2386226 Over a year ago

I get the error : Incompatible types. Required Single<Profile> but 'getObjectListSingle' was inferred to Single<List<T>>: no instance(s) of type variable(s) T exist so that List<T> conforms to Profile

Mauro Curbelo Over a year ago

@MarissaNicholas You can use map like so getObjectListSingle(Person.class) .map(list -> list.get(0)

user2386226 Over a year ago

still throws an error like "expected begin_object" but was a STRING at line 1 column 1 path 0

Michał Ziober Over a year ago

@MarissaNicholas, it means that JSON payload which is returned from sever is invalid. Could you show your JSON which you received?

user2386226 Over a year ago

[{"Name": "this", "Email","[email protected]"}] this is the json i receive

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